For a bright red LED, use 1.990VDC (about 5mA): To drop to 1.990V from 220VAC, you can either use a voltage divider (with suitable current), or a single resistor. In the case of a single resistor, you can use a 61K resistor: (220 * Math.sqrt(2) - 1.99) / 0.005 => 61827.39674441618 A close common value is either 68K or 56K. The trick to using a North American GFCI in a 230V single-phase application is they must be 2-pole GFCI circuit breakers. You must get a North American service panel/load center/consumer unit intended for 120/240V split-phase, and wire neutral as a hot: so Euro-hot+neutral go to "hot" L1 and L2. A: The VC2000W is a step up or step down voltage transformer so input voltage can be 110V ~ 120V or 220V ~ 240V (Single phase). 2000 Watts at 110V is 18 Amps so your wall outlet should be on a circuit that supports 20 Amps or more depending on the appliance you are trying to power.
However, they have access to 220V. They use 220V to run heavy items like power tools and dryers. Whether you prefer 110V or 220V, the wire size doesn’t change. You can apply the wire sizes from a 110V system to a 220V system. For example. The 12-gauge wire you find in a 220V 20-amp power tool will work on a 20A 110V device.
Figure 1. Double-primary, double-secondary wiring options. The twin 110 V primary type transformer can be configured as shown in Figure 1 (a) and (b) to work on either 220 V or 110 V wiring. Just ensure that the transformer VA rating matches or exceeds that which is replacing - and given that the original burnt out "exceeds" would be better.
Switching to 220V will have no impact on the heat generated by the servers. It might save you a few pennies a month on your power bill, but with only 4 servers, there is no chance it will pay for itself any time soon. The unit of energy is the WATT. A server draws N watts, whether supplied by 220V or 120V.
I want to buy a AC voltage converter for frequent international travel with some small appliances, and should support step up and down between 110V and 220V; found this one M60M0y0.
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    • can i use 230v in 220v